1. Scope

1.1 This guide covers a procedure for using ASTM Standard Reference Blacks (SRBs) to continuously monitor the precision of those carbon black test methods for which standard values have been established. It also offers guidelines for troubleshooting various test methods.

1.2 This guide establishes the x-chart control limits to be used when continuously monitoring those tests listed in Section . Alternatively, these control limits may be used as a basis for comparison to testing precision computed within a laboratory.

1.3 This guide uses statistical control chart methodology as discussed in STP-15-D to determine if a laboratory's test results differ significantly from the accepted values of the SRBs.

1.4 This guide provides a statistical procedure for improving test reproducibility when a laboratory cannot physically calibrate its apparatus to obtain the standard values of the ASTM SRBs, within the ranges given in the precision statement of the test method.

1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1510 Test Method for Carbon Black--Iodine Adsorption Number

D1513 Test Method for Carbon Black, Pelleted--Pour Density

D1765 Classification System for Carbon Blacks Used in Rubber Products

D2414 Test Method for Carbon Black--Oil Absorption Number (OAN)

D3037 Test Method for Carbon Black--Surface Area by Nitrogen Adsorption

D3191 Test Methods for Carbon Black in SBR (Styrene-Butadiene Rubber)--Recipe and Evaluation Procedures

D3192 Test Methods for Carbon Black Evaluation in NR (Natural Rubber)

D3265 Test Method for Carbon Black--Tint Strength

D3493 Test Method for Carbon Black--Oil Absorption Number of Compressed Sample (COAN)

D3765 Test Method for Carbon Black--CTAB (Cetyltrimethylammonium Bromide) Surface Area

D4820 Test Methods for Carbon Black--Surface Area by Multipoint B.E.T. Nitrogen Adsorption

D5816 Test Methods for Carbon Black--External Surface Area by Multipoint Nitrogen Adsorption

D6556 Test Method for Carbon Black--Total and External Surface Area by Nitrogen Adsorption

Keywords

carbon black; continuously monitoring testing; SRBs; standard reference blacks; statistical control charts: Bias; Carbon black; Data analysis--carbon black/rubber; Monitoring; Precision--carbon black test methods; Reference blacks; Standard Reference Blacks (SRB); Statistical methods--carbon black/rubber applications;

ICS Code

ICS Number Code 83.040.20 (Rubber compounding ingredients)

DOI: 10.1520/D4821-06

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